Wiring up a phone agent looks like a weekend project. Twilio Media Streams gives you a WebSocket with raw audio, you push it into a streaming STT, you feed the transcript to an LLM, you stream the reply into a TTS and send the bytes back. A few hundred lines.
Source: [Dev.to](https://dev.to/petersoos/when-is-it-safe-to-open-the-microphone-building-a-realtime-voice-agent-on-twilio-3ddo)